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UNITED STATES PATENT OFFICE.

ROBERT W. I-IOCHSTETTER, OF CINCINNATI, OHIO, ASSIGNOR TO THE AULT &WIBORG COMPANY, OF SAME PLACE.

COMPOSITION OF MATTER.

SPECIFICATION forming part of Letters Patent No. 619,889, dated February21, 1899.

Application filed September 3 l 89 8.

To all? whom it may concern.-

Be it known that I, ROBERT W. HOCHsTET- TER, a citizen of the UnitedStates, and a resident of Cincinnati, county of Hamilton, and State ofOhio, have invented a new and useful composition of matter to be used inthe production of an indelible canceling or stampin g ink for cancelingpapers, postage-stamps, checks, tickets, and other similar articles, ofwhich the following is a full specification.

The object of my invention is to produce a canceling or stamping inkwhich shall be indelible and which when applied shall penetrate the bodyand substance of the check or stamp or paper and which cannot be erasedor removed without destroying the paper itself, and thus of courseprevent a reuse of stamps or papers of any kind which have once beencanceled with this ink, irrespective of the solvent or means used inattempting to remove this canceling-ink.

Another object of my invention is to produce an ink with the abovequalities which will not dry on the pad, which will practically remainmoist and ready for use at all times, and even when the ink is all usedoff the pad the pad will remain soft and ready for further use and willnot become hard and useless. While the ink has this non-drying qualityon the pad when transferred by the stamp to paper or similar substance,it is quickly absorbed and dries rapidly.

I attain these objects by introducing a new element in the manufactureof canceling-inks. I desire that the ink shall dry slowly when appliedto the pad, but when applied to the paper that it shall dry quickly byabsorption and not by oxidation. The pad of course absorbs the ink tothe point of saturation and holds it continuously in a moist conditionas a sponge. As it is extracted from the pad by the canceling-stencilthe quantity in the pad of course diminishes, but leaves the pad softand pliable, while the small quantity taken off and applied to the paperpenetrates the paper and dries quickly by absorption and distributionthrough the fibers of the paper. The new element or ingredient by whichI secure these results is an oil-soluble color, which is a coal-tarproduct dissolved in oil or a fatty acid diluted down with any non-drying oil, an example of which is nigrosine.

In practice I dissolve the oil-soluble color Serial No. 690,218. (Nospecimens.)

in oleic acid, which is a fat or fatty acid, and the trade-name of whichis olein-oil, and dilute it with a non-drying oil, such as rosin-oil.

While I do not limit myself to any exact proportions, in order toillustrate the application of my invention I will state that in theformula I am using to-day to produce one hundred and fifty-one and aquarter pounds of canceling-ink I use one and ahalf pounds ofoil-soluble color dissolved in two pounds four ounces of olein-oil oroleic acid diluted in one hundred and twelve and a half pounds ofrosin-oil, or I may use any other non-dryin g oil. This composition iswhat produces the qualities desired and above described. I mix thiscomposition with thirty-five pounds of an ink made by grinding onehundred pounds of raw rosin-oil and eight pounds carbon-black and eightpounds of lampblack. The canceling-ink thus produced is a little tooheavy in body for practical use, and I then reduce it by introducing sixpounds of benzin mixed with a small quantity of oil of murbane toproduce a pleasant odor.

In giving the above description of the ink I am making I do not want tobe understood as limiting myself to this formula. The novel element isthe introduction of an oil-soluble color dissolved in oleic acid anddiluted with a non-drying oil.

It will be readily understood that to produce the qualities sought thismay be combined with inks made by other formulas, and

What I desire to claim and secure by Letters Patent is 1. Theherein-described composition of matter for use in the manufacture ofcancelinginks, consisting of an oil-soluble color, 6. g., nigrosine,dissolved in oleic acid or its equivalent, and diluted with a non-dryingoil, in substantially the proportions set forth.

2. A canceling-ink produced by any of the usual formulas, to which isadded as an ingredient the composition produced by dissolving anoil-soluble color, e. g., nigrosine, in oleic acid or its equivalent,and diluting it with a non-drying oil, in substantially the proportionsset forth.

ROBERT W. HOCIISTETTER.

Witnesses:

CLARENCE E. MEHLHOPE, GEORGE HEIDMAN.

